KR20150039034A - Liquid crystal display device and method for fabricating the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of realizing a narrow bezel. The disclosed invention comprises: a light source unit which provides light to a panel; a light guide plate which is disposed on a side of the light source unit and converts incident light from the light source into plane light to guide the converted light to the liquid crystal panel; an optical sheet which is disposed on the light guide plate; a reflective sheet which is disposed on a rear surface of the light guide plate; a lower cover which accommodates the light guide plate, the optical sheet, and the reflective sheet; a liquid crystal panel which is disposed on the top of the optical sheet mounted on the light guide plate; and a tape pad which is integrally attached between the rear surface of the liquid crystal panel and the upper surface of the optical sheet, and to the side of the lower cover.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquid crystal display device and a method of manufacturing the same,

The present invention relates to a liquid crystal display (LCD), and more particularly, to a liquid crystal display capable of realizing a Narrow Bezel product by applying a tape pad having a double-sided adhesive portion in place of the guide panel, A display device and a manufacturing method thereof.

BACKGROUND ART In general, a liquid crystal display (LCD) displays a desired image by adjusting the light transmittance of liquid crystal cells arranged in a matrix according to image signal information. Thereby forming an image on the panel.

The liquid crystal display device using such a principle has a tendency of widening its application range due to features such as light weight, thinness and low power consumption driving. In accordance with this trend, liquid crystal display devices are used in office automation equipment, audio / video equipment, and the like. In such a liquid crystal display device, a light transmission amount is adjusted according to a signal applied to a plurality of control switches arranged in a matrix form to display a desired image on a screen.

2. Description of the Related Art In recent years, liquid crystal display devices have been extensively applied to computer monitors, televisions, display devices of vehicle navigator systems, and portable display devices such as notebook computers and cellular phones.

Since most of the liquid crystal display devices described above are non-emissive type display devices that display an image by adjusting the amount of a light source coming from the outside, a backlight including a separate light source for irradiating light to the liquid crystal display panel We need a unit.

A conventional liquid crystal display device having such a backlight unit will be described with reference to FIGS. 1 and 2. FIG.

1 is a schematic plan view of a liquid crystal display device according to the related art, and is a plan view schematically showing a display area and a non-display area.

FIG. 2 is a cross-sectional view taken along a line II-II in FIG. 1, and is a schematic cross-sectional view of a conventional liquid crystal display device.

1, the liquid crystal display device 1 according to the related art comprises a display region 1a and a non-display region 1b defined in the edge portion of the display region 1a, that is, a bezel region .

 2, the liquid crystal display device 1 according to the related art includes a liquid crystal panel 10, a backlight unit 15 for supplying light to the liquid crystal panel 10, A guiding panel 40 which surrounds and supports the backlight unit 15 and the backlight unit 15 and a light shielding member 40 attached to the upper edge of the backlight unit 15 to adhere the liquid crystal panel 10 onto the guide panel 40 And a lower cover 70 which is coupled to the guide panel 40 and accommodates the backlight unit 15.

The liquid crystal panel 10 includes a color filter array substrate 10a and a TFT array substrate 10b and a liquid crystal layer (not shown) interposed therebetween. The color filter array substrate 10a and the TFT array substrate And upper and lower polarizers 15a and 15b are attached to the respective outer surfaces of the first and second polarizing plates 10a and 10b.

In this liquid crystal panel 10, liquid crystal cells constituting pixel units are arranged in a matrix form, and liquid crystal cells adjust image transmittance according to image signal information transmitted in a driver driving circuit (not shown) to form an image.

The backlight unit 15 includes a light source unit (not shown) for generating light, a light guide plate 30 for providing the light generated from the light source unit to the front surface of the liquid crystal panel 10, And a plurality of optical sheets (60) stacked on the front surface of the light guide plate (30) to scatter light emitted from the light guide plate (30) (20).

Here, the light source unit (not shown) includes a plurality of LED elements (not shown) and a substrate (not shown) on which the LED elements (not shown) are mounted.

The plurality of optical sheets 20 are for diffusing and condensing the light incident from the light guide plate 30 and include a diffusion sheet 21, a prism sheet 23 and a protective sheet 25 ).

The light guide plate 30 is disposed on one side of the light source unit (not shown) and disposed on the back surface of the liquid crystal panel 10 so that the light generated from the light source unit (not shown) .

The shielding tape 80 is attached to the upper edge of the guide panel 40 and bonded to the guide panel 40 by bonding the liquid crystal panel 10 to the liquid crystal panel 10, Light shielding or the like is prevented by the shielding tape 80.

The guide panel 40 is formed in a rectangular frame shape surrounding the side surface of the light guide plate 30 and is made of a plastic material such as a PC material or a metal material. The guide panel 40 is provided with a panel seating portion 40a on the upper surface thereof and the edge portion of the liquid crystal panel 10 is supported by the panel seating portion 40a.

The reflective sheet 60 is provided under the light guide plate 30 and reflects a part of the light emitted to the lower portion of the light guide plate 30 to the exit surface of the backlight unit 15 to increase the light efficiency, Adjust the reflection amount so that the entire light emitting surface has a uniform luminance distribution.

The lower cover 70 includes a light guide plate 30 that is wrapped by the guide panel 40 and a backlight unit 1 including the optical sheet 20 and the reflective sheet 60 Are housed in a liquid crystal display device.

However, in the liquid crystal display according to the related art, as shown in FIG. 2, the guide panel 40 for supporting the liquid crystal panel needs a thickness T of a certain thickness or more for securing the ejectability, The implementation of the bezel (Narrow Bezel) becomes difficult.

In addition, since the liquid crystal display according to the related art requires a guide panel to support the liquid crystal panel, a mold for producing the guide panel is separately required, which increases the cost of the product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and it is an object of the present invention to provide a narrow bezel product by applying a tape pad having a double- And a method of manufacturing the liquid crystal display device.

A liquid crystal display device according to the present invention includes: a light source unit for supplying light to a panel; A light guide plate positioned at a side of the light source unit and converting the light incident from the light source into planar light and advancing the light to the liquid crystal panel side; An optical sheet disposed on the light guide plate; A reflective sheet disposed on a back surface of the light guide plate; A lower cover in which the light guide plate, the optical sheet, and the reflective sheet are accommodated; And a liquid crystal panel disposed above the optical sheet on the light guide plate; And a tape pad attached between a rear surface of the liquid crystal panel and an upper surface of the optical sheet, and a side surface of the lower cover.

A method of manufacturing a liquid crystal display device according to the present invention includes: providing a lower cover; Attaching one end of a tape pad to an outer surface of the lower cover; And a light guide plate disposed at a side of the light source unit and converting light incident from the light source into planar light and advancing the light to the liquid crystal panel side, in order; Disposing an optical sheet on the light guide plate; Bending and attaching the other end of the tape pad so that the other end of the tape pad is positioned on a top edge of the optical sheet; And disposing a liquid crystal panel on the other end of the tape pad and bonding the liquid crystal panel to the tape pad.

A narrow bezel can be realized by applying a tape pad having a double-sided adhesive portion for the guide panel instead of the guide panel, which has made it impossible to implement a conventional narrow bezel in the liquid crystal display device and its manufacturing method according to the present invention. . In particular, by using a tape pad having a double-sided adhesive portion, the liquid crystal panel can be adhered to and supported on the outer surface of the lower cover and on the optical sheet, thereby fully performing the functions of the existing guide panel. It is possible to realize a narrow bezel of a liquid crystal display device with a thickness as large as the thickness.

The liquid crystal display device and the method of manufacturing the same according to the present invention can be applied to a manufacturing method of a liquid crystal display device and a manufacturing method thereof by omitting a guide panel and applying a tape pad having a double- The manufacturing cost of the product is reduced.

1 is a schematic plan view of a liquid crystal display device according to the related art, and is a plan view schematically showing a display area and a non-display area.
FIG. 2 is a cross-sectional view taken along a line II-II in FIG. 1, and is a schematic cross-sectional view of a conventional liquid crystal display device.
3 is a schematic plan view of a liquid crystal display device according to the present invention, and is a plan view schematically showing a display area and a non-display area.
4 is an exploded perspective view of a liquid crystal display device according to the present invention.
5 is a cross-sectional view taken along line V-V of FIG. 4, and is a schematic cross-sectional view of a liquid crystal display device according to the present invention.
6 is a schematic perspective view of a tape pad of a liquid crystal display device according to the present invention.
Fig. 7 is a cross-sectional view taken along the line VII-VII in Fig. 6, and is a cross-sectional view schematically showing a double-side bonding portion of a tape pad.
8A to 8E are cross-sectional views of the manufacturing process of a liquid crystal display device according to the present invention, which are schematic sectional views showing a first embodiment of a process of assembling a liquid crystal display device.
FIGS. 9A to 9E are cross-sectional views of a manufacturing process of a liquid crystal display device according to the present invention, which schematically show a second embodiment of a process of assembling a liquid crystal display device.
10 is a view illustrating a liquid crystal display device according to another embodiment of the present invention in which one side of a tape pad is attached to an inner surface of a lower cover.

Hereinafter, a liquid crystal display device to which a tape pad according to the present invention is applied will be described in detail with reference to the accompanying drawings.

3 is a schematic plan view of a liquid crystal display device according to the present invention, and is a plan view schematically showing a display area and a non-display area.

3, the liquid crystal display device 100 according to the present invention includes a display region 100a and a non-display region (not shown) defined in the edge portion of the display region 100a, that is, a bezel region Consists of.

4 is an exploded perspective view of a liquid crystal display device according to the present invention.

5 is a cross-sectional view taken along line V-V of FIG. 4, and is a schematic cross-sectional view of a liquid crystal display device according to the present invention.

As shown in FIGS. 4 to 5, the liquid crystal display 100 according to the present invention includes a liquid crystal panel 110; A light source unit 150 for supplying light to the liquid crystal panel 110; A light guide plate 130 and an optical sheet 120 disposed on the back surface of the liquid crystal panel 10 to guide the light generated from the light source unit 150 to the back surface of the liquid crystal panel 110; A lower cover 170 in which the light guide plate 130 and the light source unit 150 are accommodated; And a tape pad (not shown) interposed between the upper surface of the optical sheet 120 and the rear edge of the liquid crystal panel 110 to support the liquid crystal panel 110 180).

Here, the liquid crystal panel 110 includes a color filter array substrate 110a, a TFT array substrate 110b, and a liquid crystal layer (not shown) interposed therebetween. Although not shown in the drawing, the liquid crystal panel 110 is attached to the front surface of the color filter array substrate 110a and the back surface of the TFT array substrate 110b so that light transmitted through the liquid crystal panel 110 is cross- And a front polarizing plate 115a and a rear polarizing plate 115b.

In this liquid crystal panel 110, liquid crystal cells constituting pixel units are arranged in a matrix form, and the liquid crystal cells adjust the light transmittance according to the image signal information transmitted from the driver driving circuit 113 to form an image.

A plurality of gate lines and a plurality of data lines are formed in a matrix form on the TFT array substrate 110b. Thin film transistors (TFT) are formed at intersections of the gate lines and the data lines, Respectively.

The signal voltage transferred from the driver driving circuit 113 is applied between the pixel electrode and a common electrode (not shown) of the color filter array substrate 110a to be described later, and the liquid crystal between the pixel electrode and the common electrode The light transmittance is determined according to the signal voltage.

Although not shown in the figure, the color filter array substrate 110a includes a color filter and a common electrode in which red, green, and blue or cyan, magenta, and yellow are repeatedly formed with a black matrix as a boundary. The common electrode is made of a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide).

A driving driver 113 for driving unit pixels formed on the liquid crystal panel and a flexible printed circuit board (FPCB) 117 connected to one end of the liquid crystal panel are formed on one side of the liquid crystal panel 110 ).

The backlight unit (not shown) includes a light source unit 150 for generating light, a light guide plate 130 for providing light generated from the light source unit 150 to the front surface of the liquid crystal panel 110, And a plurality of optical sheets 140 stacked on the entire surface of the light guide plate 130 and scattering light emitted from the light guide plate 130. The light guide plate 130 includes a light guide plate 130, (120).

Here, the light source unit 160 may be a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), or a light emitting diode (LED) Here, the case where a light emitting diode element (LED element) is applied is taken as an example.

The light source unit 150 includes an LED element 151 and a substrate 153 on which the LED element 151 is mounted.

The LED element 151 is a side view type element and the LED element 151 outputs light toward the light incidence surface 130a of the light guide plate 130. [ The substrate 153 is a flexible printed circuit board having excellent warpage, and a circuit (not shown) is formed therein to supply external power to the LED element 151 through the circuit.

The plurality of optical sheets 120 are for diffusing and condensing the light incident from the light guide plate 130. The diffusion sheets 121 and the prism sheet 123 and the protective sheet 125 ). In some cases, it may be provided with two diffusion sheets and two prism sheets. At this time, the diffusion sheet 121 is composed of a base plate and a bead coating layer formed on the base plate.

The diffusion sheet 121 diffuses the light from the light source unit 150 and supplies the light to the liquid crystal panel 110. The diffusion sheet 121 may be used by overlapping two or three sheets.

In addition, the prism sheet 123 has a triangular columnar prism formed on the upper surface thereof with a predetermined arrangement.

The prism sheet 123 functions to condense the light diffused in the diffusion sheet 121 in a direction perpendicular to the plane of the upper liquid crystal panel 110. Normally, two prism sheets 123 are used, and the micro prisms formed on the respective prism sheets 123 form a predetermined angle.

Therefore, the light passing through the prism sheet 123 is almost vertically propagated to provide a uniform luminance distribution. The protective sheet 125 located at the uppermost position protects the prism sheet 123 which is weak against the scratch.

Although not shown, the light guide plate 130 includes a light incident surface on which the light is incident from the LED 151, a light exit surface (not shown) extending from the light entrance surface and facing the liquid crystal panel 110, And a back surface on which a dot pattern (not shown) is formed such that light emitted from the LED device 151 toward a light incidence surface (not shown) advances to the light exiting surface.

The light guide plate 130 is disposed on one side of the LED element 151 and disposed on the back surface of the liquid crystal panel 110 so that the light generated from the LED element 151 is incident on the back surface of the liquid crystal panel 110 . The light guide plate 130 converts the light emitted from the LED element 151 disposed adjacent to one side of the light guide plate 130, that is, the light incident side (not shown), into a plane light And is uniformly transmitted to the liquid crystal panel 110 through the light surface. The light guide plate 130 may be made of PMMA (polymethyl methacrylate), which has high strength and is not easily deformed or broken and has a high transmittance.

Here, the light guide plate 130 may be a wedge whose lower surface is inclined and whose upper surface is flat, or a plate type whose lower surface and upper surface are both parallel. A wedge-shaped light guide plate 130 may be applied to a liquid crystal display device applied to a small-sized product such as a notebook PC or a mobile phone, and the light source unit 150 may be provided on a thicker side wall.

The reflective sheet 160 reflects a part of light emitted to a lower portion of the light guide plate 130 to a light output surface of a backlight unit (not shown) to increase the light efficiency and adjust the reflection amount of the entire incident light, So as to have a luminance distribution.

The lower cover 170 is shaped like a rectangular box with an opened upper part and the components of the backlight unit (not shown) including the light guide plate 130, the optical sheet 120, and the reflection sheet 160 are accommodated.

One end of the tape pad 180 is interposed between the rear edge of the liquid crystal panel 110 and the top edge of the optical sheet 120 to support the liquid crystal panel in a fixed state And the other end of the tape pad 180 is attached to the outer surface of the lower cover 170 to securely support the liquid crystal panel 110 bonded to the tape pad 180.

6 is a schematic perspective view of a tape pad of a liquid crystal display device according to the present invention.

Fig. 7 is a cross-sectional view taken along the line VII-VII in Fig. 6, and is a cross-sectional view schematically showing a double-side bonding portion of a tape pad.

6 and 7, the tape pad 180 is opened at a portion of the liquid crystal display device 100 facing the display region 100a, and a portion of the tape pad 180 facing the non- And two bonding portions 183 and 185 are included. At this time, the first and second adhesive portions 183 and 185 constituting the tape pad 180 are integrally formed.

Particularly, the tape pad 180 includes a pad body 181, a first bonding portion 183 formed on one entire surface of the pad body 181, and a second bonding portion 183 formed on a part of the other surface of the pad body 181 183). That is, the first adhesive portion 183 of the tape pad 180 is formed on the entire rear surface of the tape pad 180, and the second adhesive portion 185 is formed only on one side of the upper surface of the tape pad 180 have.

The first adhesive portion 183 is attached to the outer surface of the lower cover 170 and the upper surface edge portion of the optical sheet 120. The second adhesive portion 185 is formed by bending the tape pad 180, And is attached to the top edge of the optical sheet 120 and the back edge of the liquid crystal panel 110 corresponding thereto.

The lower cover 170 containing the liquid crystal panel 110, the light guide plate 130 and the optical sheet 120 is attached to the rear edge of the liquid crystal panel 110 and the outer surface of the lower cover 170 And the liquid crystal display device 100 is connected to the liquid crystal display device 100 by the tape pads 180 formed thereon.

As described above, in the liquid crystal display device according to the present invention, a narrow bezel can be realized by omitting the guide panel which makes it impossible to realize a conventional narrow bezel and by applying a tape pad having a double- do. In particular, by using a tape pad having a double-sided adhesive portion, the liquid crystal panel can be adhered to and supported on the outer surface of the lower cover and on the optical sheet, thereby fully performing the functions of the existing guide panel. It is possible to realize a narrow bezel of a liquid crystal display device with a thickness as large as the thickness.

Further, the liquid crystal display according to the present invention does not require a guide panel and uses a tape pad having a double-sided adhesive portion as a substitute for the guide panel, thereby making it unnecessary to manufacture a mold and repetitive molds used for manufacturing a guide panel, The manufacturing cost of the device is reduced.

A method of manufacturing a liquid crystal display device according to the present invention will be described with reference to FIGS. 8A to 8E.

8A to 8E are cross-sectional views of the manufacturing process of a liquid crystal display device according to the present invention, which are schematic sectional views showing a first embodiment of a process of assembling a liquid crystal display device.

8A, first and second adhesive portions 183 and 185 are formed at portions of the liquid crystal display device 100 opposed to the display region 100a and opposed to the non-display region 100b And the tape pads 180 having the first and second bonding portions 183 and 185 integrally formed thereon are prepared. The first adhesive portion 183 of the tape pad 180 is formed on the entire rear surface of the tape pad 180 and the second adhesive portion 185 is formed on only one side of the upper surface of the tape pad 180 have.

Referring to FIG. 8B, the light guide plate 130 is formed in a rectangular box shape having an open top, and a lower portion (not shown) in which components of the backlight unit (not shown) including the light guide plate 130, the optical sheet 120, The cover 170 is prepared.

Referring to FIG. 8C, a first bonding portion 183 formed on one end of the tape pad 180 is bonded to the outer surface of the lower cover 170.

8C, a light source unit (not shown in FIG. 4) 150 is formed on an inner bottom surface of the lower cover 170, a reflective sheet 160, a light guide plate 130 is disposed on a side surface of the light source unit 150, And the optical sheet 120 are stacked in this order.

Here, the light source 160 may be a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), or a light emitting diode (LED) Here, the case where a light emitting diode element (LED element) is applied is taken as an example.

The light source unit 150 includes an LED device 151 and a substrate 153 on which the LED device 151 is mounted and the LED device 151 is a side view type device, The light source 151 emits light toward the light incidence surface 130a of the light guide plate 130. [ The substrate 153 is a flexible printed circuit board having excellent warpage, and a circuit (not shown) is formed therein to supply external power to the LED element 151 through the circuit.

The reflection sheet 160 reflects a part of the light emitted to the lower portion of the light guide plate 130 to the light output surface of a backlight unit (not shown) to increase the light efficiency and adjust the reflection amount of the entire incident light, So as to have a uniform luminance distribution.

The light guide plate 130 is disposed on one side of the LED element 151 and disposed on the back surface of the liquid crystal panel 110 so that the light generated from the LED element 151 is incident on the back surface of the liquid crystal panel 110 . The light guide plate 130 converts the light emitted from the LED element 151 disposed adjacent to one side of the light guide plate 130, that is, the light incident side (not shown), into a plane light And is uniformly transmitted to the liquid crystal panel 110 through the light surface.

The optical sheet 120 diffuses and condenses the light incident from the light guide plate 130 and includes a diffusion sheet 121, a prism sheet 123, and a protective sheet 125. At this time, the light passing through the prism sheet 123 almost vertically progresses to provide a uniform luminance distribution, and the protective sheet 125 located at the uppermost position protects the prism sheet 123 which is weak against scratches.

8D, after bending the other end of the tape pad 180, a first bonding portion 183 formed on the back surface of the bent portion is bonded to the upper surface edge portion of the optical sheet 120 . At this time, a second adhesive portion 185 is provided on the upper surface of the bent portion of the tape pad 180.

8E, a second adhesive portion 185 provided on the upper surface of the tape pad 180 corresponding to the first adhesive portion 183 adhered to the upper surface edge portion of the optical sheet 120 And the liquid crystal panel 110 is mounted on the LCD panel 100, thereby completing the assembling process of the liquid crystal display device 100 according to the present invention.

At this time, the liquid crystal panel 110 includes a color filter array substrate 110a, a TFT array substrate 110b, and a liquid crystal layer (not shown) interposed therebetween. Although not shown in the drawing, the liquid crystal panel 110 is attached to the front surface of the color filter array substrate 110a and the back surface of the TFT array substrate 110b so that light transmitted through the liquid crystal panel 110 is cross- And a front polarizing plate 115a and a rear polarizing plate 115b.

In this liquid crystal panel 110, liquid crystal cells constituting pixel units are arranged in a matrix form, and liquid crystal cells adjust the light transmittance according to image signal information transmitted in a driver driving circuit (not shown in FIG. 4, 113) Thereby forming an image.

As described above, in the method of manufacturing a liquid crystal display device according to the present invention, a narrow bezel is implemented by applying a tape pad having a double-sided adhesive portion in place of the guide panel, . In particular, by using a tape pad having a double-sided adhesive portion, the liquid crystal panel can be adhered to and supported on the outer surface of the lower cover and on the optical sheet, thereby fully performing the functions of the existing guide panel. It is possible to realize a narrow bezel of a liquid crystal display device with a thickness as large as the thickness.

In addition, the method of manufacturing a liquid crystal display according to the present invention eliminates the need for a mold manufacturing cost and a repetitive mold used for manufacturing a guide panel by omitting a guide panel and applying a tape pad having a double- The manufacturing cost of the product is reduced.

A method of manufacturing a liquid crystal display device according to another embodiment of the present invention will be described with reference to FIGS. 9A to 9D.

FIGS. 9A to 9E are cross-sectional views of a manufacturing process of a liquid crystal display device according to the present invention, which schematically show a second embodiment of a process of assembling a liquid crystal display device.

9A, first and second adhesive portions 183 and 185 are provided at portions of the liquid crystal display device 100 opposed to the display region 100a and opposed to the non-display region 100b And the tape pads 180 having the first and second bonding portions 183 and 185 integrally formed thereon are prepared. The first adhesive portion 183 of the tape pad 180 is formed on the entire rear surface of the tape pad 180 and the second adhesive portion 185 is formed on only one side of the upper surface of the tape pad 180 have.

Next, referring to FIG. 9B, a liquid crystal panel 110 in which liquid crystal cells constituting pixel units are arranged in a matrix form is prepared.

At this time, the liquid crystal panel 110 includes a color filter array substrate 110a, a TFT array substrate 110b, and a liquid crystal layer (not shown) interposed therebetween. Although not shown in the drawing, the liquid crystal panel 110 is attached to the front surface of the color filter array substrate 110a and the back surface of the TFT array substrate 110b so that light transmitted through the liquid crystal panel 110 is cross- And a front polarizing plate 115a and a rear polarizing plate 115b.

The liquid crystal panel 110 forms an image by adjusting the light transmittance of the liquid crystal cells according to the image signal information transmitted from a driver driving circuit (not shown in FIG. 4, 113).

Then, a second bonding portion 185 provided at the other end of the tape pad 180 is bonded to a rear edge portion of the liquid crystal panel 110.

9C, a rectangular box-like shape having an opened upper portion and a lower portion (not shown) in which components of the backlight unit (not shown) including the light guide plate 130, the optical sheet 120, and the reflective sheet 160 are accommodated The cover 170 is prepared.

9D, a light source unit (not shown), a reflective sheet 160, a light guide plate 130, and an optical sheet 120 are sequentially stacked on the inner bottom surface of the lower cover 170, .

Here, the light source 160 may be a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), or a light emitting diode (LED) Here, the case where a light emitting diode element (LED element) is applied is taken as an example.

The light source unit 150 includes an LED device 151 and a substrate 153 on which the LED device 151 is mounted and the LED device 151 is a side view type device, The light source 151 emits light toward the light incidence surface 130a of the light guide plate 130. [ The substrate 153 is a flexible printed circuit board having excellent warpage, and a circuit (not shown) is formed therein to supply external power to the LED element 151 through the circuit.

The reflection sheet 160 reflects a part of the light emitted to the lower portion of the light guide plate 130 to the light output surface of a backlight unit (not shown) to increase the light efficiency and adjust the reflection amount of the entire incident light, So as to have a uniform luminance distribution.

The light guide plate 130 is disposed on one side of the LED element 151 and disposed on the back surface of the liquid crystal panel 110 so that the light generated from the LED element 151 is incident on the back surface of the liquid crystal panel 110 . The light guide plate 130 converts the light emitted from the LED element 151 disposed adjacent to one side of the light guide plate 130, that is, the light incident side (not shown), into a plane light And is uniformly transmitted to the liquid crystal panel 110 through the light surface.

The optical sheet 120 diffuses and condenses the light incident from the light guide plate 130 and includes a diffusion sheet 121, a prism sheet 123, and a protective sheet 125. At this time, the light passing through the prism sheet 123 almost vertically progresses to provide a uniform luminance distribution, and the protective sheet 125 located at the uppermost position protects the prism sheet 123 which is weak against scratches.

9E, a first bonding portion 183 provided on the other end rear surface of the tape pad 180 bonded to the back edge portion of the liquid crystal panel 110 is bonded to the upper surface edge portion of the optical sheet 120 So that the liquid crystal panel 110 is seated on the upper surface of the optical sheet 120.

The first bonding portion 183 provided on the back surface of the tape pad 180 is bonded to the outer surface of the lower cover 170 while bending one end of the tape pad 180. As a result, Is completed.

At this time, the liquid crystal panel 110 includes a color filter array substrate 110a, a TFT array substrate 110b, and a liquid crystal layer (not shown) interposed therebetween. Although not shown in the drawing, the liquid crystal panel 110 is attached to the front surface of the color filter array substrate 110a and the back surface of the TFT array substrate 110b so that light transmitted through the liquid crystal panel 110 is cross- And a front polarizing plate 115a and a rear polarizing plate 115b.

In this liquid crystal panel 110, liquid crystal cells constituting pixel units are arranged in a matrix form, and liquid crystal cells adjust the light transmittance according to image signal information transmitted in a driver driving circuit (not shown in FIG. 4, 113) Thereby forming an image.

As described above, in the method of manufacturing a liquid crystal display device according to the present invention, a narrow bezel is implemented by applying a tape pad having a double-sided adhesive portion in place of the guide panel, . In particular, by using a tape pad having a double-sided adhesive portion, the liquid crystal panel can be adhered to and supported on the outer surface of the lower cover and on the optical sheet, thereby fully performing the functions of the existing guide panel. It is possible to realize a narrow bezel of a liquid crystal display device with a thickness as large as the thickness.

In addition, the method of manufacturing a liquid crystal display according to the present invention eliminates the need for a mold manufacturing cost and a repetitive mold used for manufacturing a guide panel by omitting a guide panel and applying a tape pad having a double- The manufacturing cost of the product is reduced.

10 is a view showing another embodiment of the present invention in which one end of a tape pad is attached to the inner surface of the lower cover rather than attached to the outer surface of the lower cover as in the above embodiment.

Referring to FIG. 10, a liquid crystal display 200 according to the present invention includes a liquid crystal panel 210; A light source unit (not shown) for supplying light to the liquid crystal panel 210; A light guide plate 230 and an optical sheet 220 disposed on the back surface of the liquid crystal panel 210 to guide light generated from the light source unit to the back surface of the liquid crystal panel 210; A lower cover 270 in which the light guide plate 230, the light source unit, and the liquid crystal panel 210 are accommodated; And a tape pad 180 which is interposed between the upper surface of the optical sheet 220 and the rear edge of the liquid crystal panel 210 to fix the liquid crystal panel 210 therein ).

Here, the liquid crystal panel 210 includes a color filter array substrate 210a, a TFT array substrate 210b, and a liquid crystal layer (not shown) interposed therebetween. Although not shown in the drawing, the liquid crystal panel 210 is attached to the front surface of the color filter array substrate 210a and the back surface of the TFT array substrate 210b so that the light transmitted through the liquid crystal panel 210 is cross- And a front polarizing plate 215a and a rear polarizing plate 215b.

In this liquid crystal panel 210, liquid crystal cells constituting pixel units are arranged in a matrix form, and liquid crystal cells adjust image transmittance according to image signal information transmitted from the driver driving circuit 213 to form an image.

Although not shown in the drawing, a plurality of gate lines and a plurality of data lines are formed in a matrix form on the TFT array substrate 210b. Thin film transistors (TFTs) are formed at intersections of the gate lines and the data lines, Respectively.

Although not shown in the figure, the color filter array substrate 110a includes a color filter and a common electrode in which red, green, and blue or cyan, magenta, and yellow are repeatedly formed with a black matrix as a boundary. The common electrode is made of a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide).

The light source unit (not shown) may be a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), or a light emitting diode (LED) A case of applying a light emitting diode element (LED element) is taken as an example.

The optical sheet 220 is provided for diffusing and condensing light incident from the light guide plate 230 and includes a diffusion sheet 221, a prism sheet 223, and a protective sheet 225. In some cases, it may be provided with two diffusion sheets and two prism sheets. At this time, the diffusion sheet 221 is composed of a base plate and a bead coating layer formed on the base plate.

The diffusion sheet 221 serves to diffuse the light from the light source unit and supply the light to the liquid crystal panel 210. Two or three sheets of the diffusion sheet 221 may be used in a stacked manner.

The prism sheet 223 has a triangular columnar prism formed on the upper surface thereof with a predetermined arrangement.

The prism sheet 223 condenses the light diffused in the diffusion sheet 121 in a direction perpendicular to the plane of the upper liquid crystal panel 210. Normally, two prism sheets 223 are used, and a micro prism formed on each prism sheet 123 has a predetermined angle.

Therefore, the light passing through the prism sheet 223 proceeds almost vertically to provide a uniform luminance distribution. The protective sheet 225 positioned at the uppermost position protects the prism sheet 223 which is weak against the scratch.

The light guide plate 230 is disposed on the back surface of the liquid crystal panel 210 along the one side of the light source unit to guide the light generated from the light source unit to the back side of the liquid crystal panel 210. The light guide plate 230 may be formed of a light guide plate 230 and a light guide plate 230. The light guide plate 230 may include a light guide plate 230 and a light guide plate 230. The light guide plate 230 may include a light guide plate 230, And is uniformly transmitted to the liquid crystal panel 210.

The reflective sheet 260 reflects a part of light emitted to a lower portion of the light guide plate 230 to a light output surface of a backlight unit (not shown) to increase the light efficiency and adjust the reflection amount of the entire incident light, So as to have a luminance distribution.

The lower cover 270 includes a liquid crystal panel 210 and a backlight unit including the light guide plate 230 and the optical sheet 220 and the reflective sheet 260, Are housed.

One end of the tape pad 280 is interposed between the rear edge of the liquid crystal panel 210 and the top edge of the optical sheet 220 to support the liquid crystal panel in a fixed state And the other end of the tape pad 280 is attached to the inner surface of the lower cover 170 to securely support the liquid crystal panel 210 bonded to the tape pad 280.

The tape pad 280 includes a pad body 281, a first bonding portion 283 formed on the entire one surface of the pad body 281, a second bonding portion 283 formed on a portion of the other surface of the pad body 281, . A first adhesive portion 283 provided at one end of the tape pad 280 is attached to a rear edge portion of the liquid crystal panel 210. The upper surface of the optical sheet 220 is bonded to the tape pad 280 A second bonding portion 285 provided on the back surface of one end of the first bonding portion 285 is adhered.

A first adhesive portion 283 provided at the other end of the tape pad 280 is bonded to the inner surface of the lower cover 270.

In this way, the liquid crystal panel 210 is placed on the upper surface of the optical sheet 220 using the first adhesive portion 283 and the second adhesive portion 285 of the tape pad 180 as a substitute for the guide panel, The assembling process of the liquid crystal display device 200 according to the present invention is completed.

As described above, in the liquid crystal display device and the manufacturing method thereof according to the present invention, a guide pad which is impossible to realize a conventional narrow bezel is omitted and a tape pad having a double- Bezel). In particular, by using a tape pad having a double-sided adhesive portion, the liquid crystal panel can be adhered to and supported on the outer surface of the lower cover and on the optical sheet, thereby fully performing the functions of the existing guide panel. It is possible to realize a narrow bezel of a liquid crystal display device with a thickness as large as the thickness.

The liquid crystal display device and the method of manufacturing the same according to the present invention can be applied to a manufacturing method of a liquid crystal display device and a manufacturing method thereof by omitting a guide panel and applying a tape pad having a double- The manufacturing cost of the product is reduced.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

100: liquid crystal display device 110: liquid crystal panel
110a: Color filter array substrate 110b: TFT array substrate
113: driving driver 115: printed circuit board
120: optical sheet 121: diffusion sheet
123: prism sheet 125: protective sheet
130: a light guide plate 140: a panel guide
150: light source 151: LED element
153: substrate 160: reflective sheet
170: lower cover 180: tape pad
181: pad body 183: first adhesive section
185: second bonding portion t: thickness (bezel)

Claims (10)

A light source unit for supplying light to the liquid crystal panel;
A light guide plate positioned at a side of the light source unit and converting the light incident from the light source into planar light and advancing the light to the liquid crystal panel side;
An optical sheet disposed on the light guide plate;
A reflective sheet disposed on a back surface of the light guide plate;
A lower cover in which the light guide plate, the optical sheet, and the reflective sheet are accommodated;
A liquid crystal panel disposed above the optical sheet on the light guide plate; And
And a tape pad integrally attached between a back surface of the liquid crystal panel and an upper surface of the optical sheet, and a side surface of the lower cover. The liquid crystal display device according to claim 1, wherein a first bonding portion is formed on one side of the tape pad, and a second bonding portion is formed on one side of the other side of the tape pad. The liquid crystal display of claim 2, wherein the first adhesive portion of the tape pad is attached to an outer surface or an inner surface of the lower cover and an upper surface edge of the optical sheet. The liquid crystal display of claim 2, wherein the second adhesive portion of the tape pad is attached to a rear edge portion of the liquid crystal panel. Providing a bottom cover;
Attaching one end of a tape pad to an outer surface of the lower cover;
And a light guide plate and an optical sheet which are located on the side of the light source unit and convert light incident from the light source into plane light and advance to the liquid crystal panel side are stacked in order step;
Bending and attaching the other end of the tape pad so that the other end of the tape pad is positioned on a top edge of the optical sheet; And
And disposing a liquid crystal panel on the other end of the tape pad and bonding the liquid crystal panel to the tape pad. 6. The method of claim 5, wherein a first bonding portion is formed on one side of the tape pad, and a second bonding portion is formed on a side of the other side of the tape pad. The method according to claim 6, wherein the first adhesive portion of the tape pad is attached to an outer surface or an inner surface of the lower cover and a top surface of the optical sheet. The method according to claim 6, wherein the second adhesive portion of the tape pad is attached to a rear edge portion of the liquid crystal panel. The method of claim 5, wherein the tape pads are attached to the bottom cover and the rear edge of the liquid crystal panel. 10. The method of claim 9, wherein the tape pad is attached to the bottom edge of the liquid crystal panel, and then attached to the bottom cover.

Images